2. (total: 15 points). This year's colds affected a large number of persons. Consider the length of time (in days) from initial symptoms to recovery for a sample of 20 persons.

5, 6, 7, 8, 14, 14, 15, 15, 13, 10, 13, 8, 20, 15, 18, 19, 25, 16, 15, 17

a.) In the grid on the next page, plot the number of cases (N) for each range of recovery times.

\ftime to recovery ave. hours of time to recovery ave. hours of (days) sleep/day (days) sleep/day 5 10 15 7 6 9 13 8 7 10 18 O 14 8 20 6 14 8 25 5